About three weeks ago, the CyanogenMod team released the first stable build of CM9 for all compatible devices. With that, they ended active development for ICS so they could focus on building CM10 with Jelly Bean. Of course, "end development" doesn't mean "we're never touching this again" for CM devs, as they promised to offer maintenance releases and bug fix updates as needed.

Looks like the first maintenance release is now rolling out to CM's stable server, as version 9.1 is available for several devices, including the GSM Galaxy Nexus (Maguro).

There's no word on exactly what has changed since CM 9, but we assume all devices that have CM 9 stable right now will get the build within the next couple days. Keep an eye on the CM download site to see if it's available for your device.

Sadly if we wants CM9 / CM10 on the Thunderbolt we're gonna have to do it ourselves. We've been forgotten by just about everyone else

BangIShotYou

Just fyi, for those of you with the Nexus S 4G (Crespo4G), there are two files for the CM 9.1.0 Stable build. DO NOT DOWNLOAD THE NEWER/SMALLER SIZED FILE. IT WILL NOT BOOT. (If memory serves me it is 125 or 126 MB in size.)

Download the older/larger sized file, that one is confirmed as working by myself and others. (If memory serves me correctly it is 129 MB.)